Reverse brake



Nav. 13,1928.A

Ml, A.v-M1KESH REVERSE BRAKE `Filed July 18, 192.7

Patented Nov. `13, 192118.

REVERSE BRAKE.

Appiicatin inea Juis'f is My invention relates to, an auxiliary brake A for automobiles operated in conjunction ywith thejtransmission, and its primary object resides in the provision of a quickly and easily operable means which will enable. the operator tol overcome the reverse movement of the car when the latter has been halted'in ascending a' grade in the roadway.

Another object is to provide a reverse brake which is operablebyv an' overthrow of the transmission 'shifting lever.-

A further object is to provide such brake in whichthe braking'surfaces are an'gularly vdisposed with relation to the plane of `movement of the body to be braked so that sudden and positive gripping of the-parts is avoided. Otherv objects an'd advantages Will become apparent from the following description and fromv the drawings, in which:

igure 1 is a fragmentary vertical vsectional view takenV longitudinally of the transends rotatably mounted in one end of the Y mission gear housing of an automobile em-l bodying the principles of my invention.

Fig. 2 is an elevational view partially in section taken along the line 2%-2 of F ig. 1.

-Fig 3 is a fragmentary plan View of the brake taken partially in sectionl along the line 3 3 offFigrl. c While the .invention-is susceptible of various modifications'. and alternative constructions, I have shown inthe drawings 'and will herein describe in detail the preferred embodiment, but it is to be understood that i v i do not thereby Iintend to limit the invention to "1 1 housing 5 and extending longitudinally therefrom to another bearing in the end of a crankshaft 7 The clutch'sh'aft 6 is normally rotatable with respect to the crank shaft 7 but may be connected for rotation therewith by means of any' preferred clutch mechanism suchr as the clutch herein shown and designated generally b the numeral 8.

Means is provi ed to prevent undesired reverse motion of the vehicle. It will be ap- MARTIN A. MIKESH, or JERsEYcrrY, NEW JERSEY.

ramo?.

ori-1.

, 1927. semi No. 296,485.

parent that such reverse motion could be prevented by stopping the rotation of any of the shafts'which are operativelyconnected to the wheels of the vehicle. 'I prefer to provide a brake disk 10 mounted on the clutch shaft 6 near its "bearing in the end of the housing 5,

and to mount-a braking member 11 in the housing 5 so that it may be pressed therefrom into engagement with the'disk 10.

The brake disk 10 is provided with radial l corrugations 12, best shown in Fig. 8, these corrugations being in such a position that they maybe engaged by the braking meme ber 11. The braking member 11 is herein shown as comprising a lever pivoted intermediate its ends and having one end 13 adapted tofit into the corrugations 12 in the brake disk 10. The end 13 of the lever-isnormally held out of contact with the ldisk by means of .an expansive coil spring 14 mounted in the housing and engaging .the opposite end of the lever.. Means is provided whereby. the end-13 of the lever may be pressed into contact with the brake disk 10 by movementr of the transmissiongear shift while the transmissionl gears are in their low speed position; This means is herein shownv as associated with a slidevmember 15 which has a forked member 16 mounted thereon'for moving the low gear 17 and comprises a headed pin 18- which is mounted for longitudinal sliding ii'ioveinent with respect tothe slidev member 15.*. The pin is adapted toengagepthefbraking member 11 but is normally heldo'ut of ,contact therewith by an expansive coil spring 1,9

mounted about the pin 18,-between its head and an abutment 20 formed onthe slide membor l5. i l

Between the head of the pin 18 and an abutment 21 formed on the slide member 15, a recess is formed which is adapted to receive the lowerendof a conventional gear shift level'v 22, so that the slide 15 may be moved under the guidance of the lever 22.

The spring 19 is preferably of sufcient strength to withstand compression by the force ordinarily necessary for the movement of the slide 15. Itwill be apparent that after the low gear has reached its operative position and the movement of the slide has been stopped, a further movement of the' lower end of the lever 22 to the left in Fig.v 1 will compress the spring 19, force the pin 18-to the left and press the braking member 11 into contact with the brake disk 10.

. In order to overcome the objectionable positive grip afforded `by a ratchet/and pawl brake, it should be noteld that the engaging surface 13 of the braking member 11 is curved to'iit into the corrugations 12 and this surface 13 and the surface of tlie corrugations 12 will act as cams with respect to each other to urge the end of thelever 11 out of the corrugation into which'it is pressed.

These engagin/g surfaces of the braking member 11 and the brake disk 10 are, however,'atasuiiiciently great angle tothe plane of movement. .ofy the disk 10 to vmaterially lessen the force which must be applied tb the member 11 in order to hold the vehicle in a stopped position.

ing lever and that it will n ot operate with a;

sudden and positive gripping action.

-Tliisapplication forms a continuation in part of my copending application No, 8,055 filed Feb. 9, 1925.

I claim as my invention:

1. Inan automobile, a transmission shaft, a transmission shifting lever, "a brake disk fixed on said shaft, said disk having radial corrunrations formed therein, a braking membei' at apted to fit into the corrugations in said disk but normally out of contact therewith, and connections between. said lever and said member whereby said member may be brought into brakino relation to said disk by movement .of said lever.

'v 2. In an automobile, a transmissionlever,

a 'transmission shaft, a braking disk fixed on Vsaid shaft, said disk having radial corrugations formed therein,`a braking member for engaging said disk, said disk and said meinb er having cani surfaces engaging each other j which tend to force-said member away from said disk 'when said' disk rotates inveither Adirection,and means betweenv said member -and said lever whereby said member-may be moved by said'lever.

3. The comb'nation `with 'a transmission gearing system having a plurality of shafts,

- a plurality of gears including a low speed gear which has operative and inoperative positions and a slidable member' operable in its longitudinal sliding movementto move said low gear into loperative posit-ion, and a shifting lever operable to move said slidable member, o,f a reverse brake comprising a disk mounted on one of saidshafts, the outer pe'' ripheral edges of said disk having .radial corrugations, al braking membeigAa resilient means normallyA holding said braking inember away freni-said disk, and an operative connection between said shifting lever and said braking member whereby said vbraking' member may be caused to engage the corrugated portion of said disk by moving said shifting lever beyond the position necessary to put said low gear in' operative position. 4. The combination with an automobile transmission having a gear shift lever which f is movablefrom a neutral positionto a plurality of. other positions so as to place said transmission in gear, of a normally inoperative reverse brake and applying means for said brake operable by said leveirby moving said lever from its neutral position throughl i and to a point beyond one of its other positions. A

5. The combination of -a surface to y be braked, said siii-face having corrugations latera'lly of its direction of'motion and a braking member adapted to 'be pressed into con- 'tact with the'surfa'ce and to fit into said corrugations, said member having cam surfaces adapted to cooperate with the sides of the cgrrugations so that relative vmovement of the parts will'tenn to press said-member out- ,wardly of the corrugations.

6. In a reverse brake, a disk having radial corrugations, said disk being. fixed upon the member to be braked, and a braking member operable to engage said disk to prevent rotation thereof, saiddisk and said braking member presenting cam surfaces tending to move the braking member out of the depreskto a J i braking ressure to the shaft.

IP Y e P 9. In an automobile, a transmission, a transmission shifting lever, a transmission shaft, al clutch upon the latter, and` means operable by the lever to engage the clutch without disturbing the position of said transmission and restrain reverse rotation of the p shaft. v 1 p i 10. In an automobile, a transmission lever, a transmission shaft, a clutch on the shaft comprising a fixed memberandI a part in' frictional engagement there/with, in' combi-v nation with a pawl operable by movement of the transmission lever into engagementv with said frictional engaging part', to restrain rotation of the'shaft.

11. In an automobile, a transmission shaft,

braking means thereon for arresting backl ward movement of the car while geared for forward movement,'a transmission lever, and

connections therefrom operable while said Lesmo? operative.

. 12. In an automobile, atrnsmission shaft, 5 normally inoperative braking means thereon,

a, transmission lever,

- from opera and connections thereble to render the lbrekingymeans operative by further movement of the transmission lever after it has been shiftedy into starting gear, thereby arresting backward movement of the oar. v y' In` testimony whereof, I have hereunto af-u fixed my signature. I

MARTIN A. MIKESH. 

